> The other Rx or 7xxx cards listed on the page are no Polaris cards.

Even worse than not being Polaris/GCN4 cards, they are not even GCN1 cards ;-)

> Radeon R5 230 is a relabeled HD6450 which is a minimally improved
> HD5450 itself. All 3 sharing the same chipset

Both R5 230 and HD6450 use Caicos (RV910), but HD5450 uses Cedar (RV810). They are certainly not the same.

> which is certainly not the same the other Radeon Rx cards (being Polaris).

There are also many Rx cards between TeraScale 2 and GCN4/Polaris:
- GCN1: R5/R7/R9 240/250/265/270/280/330/340/350/370/430/435/450/520
- GCN2: R7/R9/RX 260/290/295/360/390/455
- GCN3: R9 285/380/Fury/Nano/530